Arjan Singh, Marshal of the Indian Air Force, passed away on Saturday after suffering a massive cardiac arrest. Singh was admitted at the Research and Referral Hospital, New Delhi. Ninety-eight-year-old Singh was the only five-star air force officer.

The military veteran was admitted to hospital following a cardiac attack on Saturday morning, as per a press release by the Press Information Bureau. As news spread of Singh's demise, several leaders took to Twitter to share their tributes.

Prime Minister Narendra Modi remembered Singh's service to the nation:

India mourns the unfortunate demise of Marshal of the Indian Air Force Arjan Singh. We remember his outstanding service to the nation. pic.twitter.com/8eUcvoPuH1

The Indian prime minister also commented on Singh's discipline. "Sometime back I met him, who despite his ill health tried to get up to salute even though I said no. Such was his soldier discipline," Modi tweeted, adding that his thoughts are with Singh's family:

My thoughts are with his family & those mourning the demise of a distinguished air warrior & fine human, Marshal of the IAF Arjan Singh. RIP — Narendra Modi (@narendramodi) September 16, 2017

Minister of Home Affairs, Rajnath Singh put out two tweets conveying his condolences, stating that the tales of Singh's courage will remain immortal.

My heartfelt condolences to the bereaved family members of Shri Arjan Singh. May God give them strength to bear this colossal loss. — Rajnath Singh (@rajnathsingh) September 16, 2017

Marshal of the IAF, Arjan Singh lived his life like a soldier. The tales of his courage will remain immortal. Deeply pained at his demise. — Rajnath Singh (@rajnathsingh) September 16, 2017

Finance minister Arun Jaitley said Singh was one of the greatest soldiers.

Condolences on the sad demise of Marshal of the Indian Air Force Arjan Singh ji. He was one of the greatest soldiers in the recent memory. — Arun Jaitley (@arunjaitley) September 16, 2017

Maharashtra chief minister Devendra Fadnavis called Singh a great leader. He said: "Maharashtra salutes and pays tributes to the great inspiration and a great leader, Marshal of the Indian Air Force." The Indian Air Force said it was a significant loss both for the nation and for the security forces.

Several leaders including BJP president Amit Shah, information and broadcasting minister Smriti Irani, sports minister Rajyavardhan Rathore and Minister of State for External Affairs, Vijay Kumar Singh, sent out condolences to Singh's loved ones and lauded the Air Force Marshal's contribution to the nation:

Marshal of IAF Arjan Singh ji led the Indian Air Force through his exemplary leadership. His rich contribution to motherland is venerable. — Amit Shah (@AmitShah) September 16, 2017

Saddened by demise of Marshal of the Indian Air Force Arjan Singh ji. Indebted for his service to the Nation. Condolences to his loved ones. — Smriti Z Irani (@smritiirani) September 16, 2017